Process of preparing dyestuff sulphonic acids of the dioxazine series



Patented Jan. 10, 1939 UNITED STATES PATENT OFFICE PROCESS OF PREPARING DYESTUFF SUL- PHONIC ACIDS OF THE DIOXAZINE SE- RIES Heinrich Greune and Max Thiele, Frankfort-onthe-Main, Germany,

assignors to General Aniline Works, Inc., New York, N. Y., a corporation of Delaware No Drawing. Application March 24, 1938, Serial No. 197,958. In Germany July 2'7, 1934 4 Claims.

wherein R and R stand for a sulphonated monovalent radical containing three nuclei and X and X for hydrogen, akyl, aryl or halogen, with an acid condensing agent such as sulphuric acid, chlorosulphonic acid, fuming sulphuric acid or an alkaline condensing agent such as ammonia, sodium carbonate, caustic soda solution or the like, preferably in the presence of an organic or 30 inorganic oxidizing agent, such as chloranil, benzoquinone, pyrolusite, permanganate, lead peroxide, hydrogen peroxide or the like.

By the use of strong sulphuric acids as condensing agents sulphonation may simultaneously 35 be effected. By using an alkaline condensing agent this sulphonation can be avoided which may be of advantage.

Sulphonated monovalent radicals containing three nuclei, which are suitable for the process 40 of the present invention, are for instance those of carbazole, diphenylene-oxide, diphenylene-dioxide, fluorene, anthracene, phenanthrene or phenanthridone.

' The lA-benzoquinone derivatives of the above formula, used as parent materials, may be made,

for instance, by causing chloranil or another 1.4- benzoquinone to react with amino-sulphonic acids of the above mentioned compounds containing three nuclei.

50 The condensation products which are obtainable from the said 1.4-benzoquinone derivatives by the process of this invention may be regarded as dioxazine-sulphonic acids and dye the animal and vegetable fiber as well as mixed fabrics very fast tints.

The following examples serve to illustrate the invention, but they are not intended to limit it thereto; the parts are by weight:

(1) 100 parts of 2.5-di-(N-ethylcarbazolyl-3'- amino-6'- sulphonic acid) 3.6-dichloro-l.4-benzoquinone of the formula:

O l H 1 go \N/ g/ -803H made, for instance, by causing chloranil to react with 3amino-(N) -ethy1carbazo1e 6 sulphonic acid in alcohol or aqueous alcohol in the presence of an acid binding agent, are introduced at about HOaS- 60 C. to about 70 C. into 2000 parts of concentrated sulphuric acid and the mixture is heated for several hours, for instance, about 2 to 5 hours, at about 90 C. to about 100 C. The solution is allowed to cool and then poured into ice-water; the precipitated dyestuff-sulphonic acid is filtered, washed With a sodium chloride solution until neutral and dried. The dyestuff thus produced dyes animal, vegetable and viscose artificial fiber as well as mixed fabrics, fast clear blue tints. For the formation of the dyestuff there may be used chlorosulphonic acid instead of concentrated sulphuric acid.

(2) 58 parts of 2.5-di-(N-methylcarbazolyl- 3'-amino-6-sulphonic acid) -3.6-dichloro-1.4- benzoquinone, made, for instance, by causing chloranil to react with 3-amino-(N)methylcarbazole-6-sulphonic acid in alcohol or aqueous alcohol in the presence of an acid-binding agent, are dissolved at ordinary temperature in 1000 parts of concentrated sulphuric acid; 40 parts of pyrolusite are added and mixed with the'solution while stirring. After the reaction is complete the mixture is poured into ice-water; the precipitated dyestuff-sulphonic acid is filtered, washed until neutral and dried. The dyeings obtained with it are similar to those of the dyestuff made according to the preceding example.

(3) 87 parts of 2.5-di-(N-ethylcarbazo1yl-3'- amino-6'-sulphonic acid) -3.6-dichloro-1.4-benzoquinone, made for instance by causing chloranil to react with B-amino-(N)ethylcarbazole-G-sulphonic acid in alcohol or aqueous alcohol in the presence of an acid-binding agent, are dissolved in 1000 parts of water. The brown solution is mixed with 14 parts of concentrated caustic soda solution; 63 parts of potassium permanganate in a solid form or in a dissolved state are added and the mixture is stirred for some time until a test sample dissolved in water appears pure blue. The mass is freed from manganese dioxide by filtration and the manganese dioxide is washed on the filter with hot water. The sulphonic acid is precipitated by adding common salt to the combined filtrates thus obtained; it is filtered, washed and dried. The dyeings obtained with it are similar to those obtained with the dyestufi obtainable as prescribed in Example 1.

(4) 100 parts of 2.5-di-(carbazolyl-3'-amino- 4-sulphonic acid) 3.6-dichloro 1.4 benzoquinone,obtainable, for instance,bycausing chloranil to react with 3aminocarbazole--sulphonic acid in aqueous alcohol, are introduced at about 70 C.

to about 80 C. into 2000 parts of sulphuric acid monohydrate and the mixture is heated for several hours, for instance, 2 to 5 hours, at about 110 C. to about 120 C. The sulphuric acid solution is then poured on ice, the precipitated dyestufi is filtered, washed with a sodium chloride solution until neutral dried. It is a sulphonic acid which is soluble in water to a blue solution and dyes animal, vegetable and. viscose artificial fiber, as Well as mixed fabrics, beautiful blue tints of very good fastness to light.

(5) 50 parts of 2,5-di-(fiuorenyl-2'-amino-disulphonic acid) -3.6-dichloro 1.4 benzoquinone, obtainable, for instance, by causing chloranil to react with sodium-Z-aminofiuorene-disulphonate in an aqueous solution in the presence of sodium acetate, are dissolved in 1500 parts of sulphuric acid monohydrate and 50 parts of pyrolusite are added at C., while cooling. After stirring for 2 hours at 20 C. the reaction mass is poured on ice, the precipitated dyestuff sulphonic acid is filtered, the solid matter is washed with sodium chloride solution until neutral and dried. The dyestuff dyes cotton and viscose artificial silk clear violet tints of good properties of fastness.

(6) 50 parts of 2.5-di-(2'-aminodiphenylenoxide-6'Su1phonic acid) -3.6-dichloro-1.4-benzoquinone, obtainable, for instance, by causing chloranil to react with sodium-2-an1inodiphenylene- 0Xide-6-sulphonate in aqueous alcohol with addi-- tion of an acid binding agent, are introduced into 1500 parts of sulphuric acid monohydrate and the whole is heated for hour at 150 C. The cooled reaction mass is poured on ice, the Whole is filtered with suction, the solid matter is washed with a sodium chloride solution until neutral and dried. The dyestuff sulphonic acid obtained dyes cotton and viscose artificial silk bluish-red tints which are distinguished by good properties of fastness.

(7) 100 parts of 2.5-di-(Nethylcarbazolyl-3- amino-disulphonic acid) -3.G-dichloro-l. l-b-enzoquinone (obtainable by condensation of chloranil and B-amino-(N) ethylcarbazol di sulphonic acid in alcohol or an aqueous solution 0;? alcohol in the presence of an acid-binding agent) are dissolved in 10,000 parts of Water while heating. 10 parts of calcined sodium carbonate are added to the brown solution obtained and then a solu- NaOOzS tion of parts of potassium permanganate in 800 parts of water is slowly run in, while stirring, at 60 C. to 70 C. When the solution become blue, it is filtered from the separated pyrolusite and the solid matter is washed with warm water.

From the filtrate the dyestufi-sulphonic acid is precipitated by means of sodium chloride, filtered, Washed until neutral and dried. It dyes similarly blue shades as the dyestufi obtained according to Example 3.

In an analogous manner there may be used instead of potassium permanganate, for instance, also potassium persulphate in an alkaline solution.

The B-amino-(N) ethylcarbazol disulphonic acid used of the following constitution C2115 is prepared, for instance, by sulphonating 3- amino-(N) -ethy1-carbazol with concentrated sulphuric acid.

(8) 100 parts of 2.5-di-(N-ethylcarbazolyl-3'- amino-6'-sulph0nic acid) -3.6-dichloro-1.4-benzoquinone (obtainable by condensation of chloranil and 3-amino-(N) -ethylcarbazol-6-sulphonic acid in alcohol or an aqueous solution of alcohol in the presence of an acid-binding agent) are dissolved at 60 C. in 7500 parts of water. 100 parts of concentrated ammonia solution are added to this solution. Thereupon a solution of 50 parts of potassium permanganate in Water is slowly added, drop by drop. When the reaction is complete, 200 parts of sodium bisulphite solution are added and the dyestuif is salted out by means of sodium chloride, filtered, washed and dried. It dyes the animal, vegetable and viscose artificial fiber similar tints as the dyestuif obtained according to the prescription of Example 1.

In the above examples there may also be used such compounds as starting materials, for the preparation of which there has been used, instead of chloranil, other 1.4-benzoquinone such as 1.4-benzoquinone itself, toluquinone or the like.

We claim:

1. The process which comprises causing an oxidizing agent of the group consisting of potassium permanganate and potassium persulphate to act in the presence of an alkaline agent of the group consisting of caustic soda solution, sodium carbonate solution and ammonia solution or a solution of a compound of the general formula:

X wherein X represents a member of the group consisting of hydrogen, halogen and alkyl and R represents a sulphonated carbazolyl radical.

2. The process which comprises causing potassium permanganate to act in the presence of caustic soda solution on a solution of the compound of the formula:

until a test sample dissolved in water appears pure blue.

3. The process which comprises causing potassium permanganate to act in small portions at a temperature of about 60 C. to 70 C. in the tassium permanganate to act in small portions at a temperature of about 60 C. in the presence presence of sodium carbonate solution on asolution of the compound of the formula:

31115 01 N\ 0 NH WSOzONa Naoofis I SOzONa Naoogs HN III/\/ 1 C2115 until a test sample dissolved in water appears of ammonia solution on a solution of the compure blue. pound of the formula:

a /N o /NHU\ s O20Na NaOO2S \HN: o 1 02115 4. The process which comprises causing pountil a test sample dissolved in water appears pure blue.

HEINRICH GREUNE. MAX THIELE. 

